references

After finishing a trade to your satisfaction, both parts may offer to act as references for each other, signalling a positive experience with each other, and letting other users know their behavior was honest. The higher the number of references the smaller the chances of having any problem when trading with that person.

On the 'references' section you can see and handle your references and those of other users.
From here you have the following options:

Add a reference to another user. This will indicate that you have made a trade with him and that he satisfied his part of the agreement by sending you the cards without problems. You only have to enter the name fo the user from whom you have received the collectible cards, and press the 'send' button.

Check the references that a user already has. Enter the name of the user you are interested in and press the 'send' button. You will get the list of those users who have given a reference to him, together with the date in which they did it.

See the list of your references. All the users are listed who gave you a reference.

See which are the users of the site who have received a greatest number of references. The 20 users who have accumulated a greatest number of references from other users are listed here.